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cli/cli.go

@@ -13,9 +13,12 @@ import (
 )
 
 // Parse parses command line arguments and returns a CLI instance.
-func Parse(osArgs []string) (*CLI, error) {
+func Parse(osArgs []string, version string) (*CLI, error) {
 	var cli CLI
 	parser := flags.NewParser(&cli, flags.HelpFlag)
+	parser.LongDescription = fmt.Sprintf(`Version %s
+		This updates the kubeconfig for Kubernetes OpenID Connect (OIDC) authentication.`,
+		version)
 	args, err := parser.ParseArgs(osArgs[1:])
 	if err != nil {
 		return nil, err

cli/cli_test.go

@@ -5,7 +5,7 @@ import (
 )
 
 func TestParse(t *testing.T) {
-	c, err := Parse([]string{"kubelogin"})
+	c, err := Parse([]string{"kubelogin"}, "version")
 	if err != nil {
 		t.Errorf("Parse returned error: %s", err)
 	}
@@ -15,7 +15,7 @@ func TestParse(t *testing.T) {
 }
 
 func TestParse_TooManyArgs(t *testing.T) {
-	c, err := Parse([]string{"kubelogin", "some"})
+	c, err := Parse([]string{"kubelogin", "some"}, "version")
 	if err == nil {
 		t.Errorf("Parse should return error but nil")
 	}
@@ -25,7 +25,7 @@ func TestParse_TooManyArgs(t *testing.T) {
 }
 
 func TestParse_Help(t *testing.T) {
-	c, err := Parse([]string{"kubelogin", "--help"})
+	c, err := Parse([]string{"kubelogin", "--help"}, "version")
 	if err == nil {
 		t.Errorf("Parse should return error but nil")
 	}

main.go

@@ -8,8 +8,11 @@ import (
 	"github.com/int128/kubelogin/cli"
 )
 
+// Set by goreleaser, see https://goreleaser.com/environment/
+var version = "1.x"
+
 func main() {
-	c, err := cli.Parse(os.Args)
+	c, err := cli.Parse(os.Args, version)
 	if err != nil {
 		log.Fatal(err)
 	}